import java.util.Scanner;

public class Esfera {
    public static void main (String[] args){
        Scanner scan = new Scanner(System.in);
        double raio = scan.nextDouble();
        double pi = 3.14159;
        double volume = (4.0 / 3.0) * pi * Math.pow(raio, 3);

        System.out.printf("VOLUME = %.3f\n", volume);

        scan.close();
    }
}
